An original technology for processing of a natural material, shungite-3 from the Zazhogino deposit (Karelia), was developed in order to obtain a new product, mixed nanocarbon material (MNS).It is suggested to obtain a nanocarbon material (MNS) by using the available natural raw material, shungite rock widely occurring in the geologic profile of the world's largest Onega basin (Republic of Karelia) of Precambrian black-shale sedimentation. To the shungite rock is commonly related a large group of compositionally different carbon-containing Precambrian geologic formations. Commonly, rocks with 5310% shungite substance are named shungitious, and those with 0.535%, shungite-containing. To highcarbon shungite rocks belong those in which the content of free shungite carbon exceeds 20%.The total estimated resources of the shungite rock of the Onega basin according to Mikhailov [1] exceed one billion tons (1041 million), and the prospected resources (of classes B + C1 + C2) of the largest Zazhogino deposit (in Medvezh'egorskii district) are 148.8 million tons (reserves 321.8 million tons), with the average content of the shungite carbon, e.g., in the Maksovskaya bed, is about 31%.Shungite (shungite rock) of the Zazhogino deposit is, on the average, composed of 30% carbon and 70% silicates [2]. It is by the content of carbon that it is referred [2] to the third variety of shungite rocks (shungite-3), or, according to the geological-genetic classification by Filippov, to maxovites, which are saprobitumolite rocks having the form of a fine homogeneous mixture of a shungite substance and a cryptocrystalline mineral substance. The conditions of the regional metamorphism of shungite rocks correspond to the chlorite and biotite zones of the greenshale facies. The microelements found in these rocks are Fe, Ti, V, Ni, Cu, and Zn, mainly in the sulfide (pyrite, pyrrhotine, sphalerite, etc.) and oxide (rutile etc.) mineral forms.The conditions in which shungites are formed, as well as their chemical and phase composition, suggest that fullerenes and(or) fulleroid components of carbon fractions are present in natural shungites. Here and hereinafter by fullerenes are meant light fullerenes C 60 and C 70 and heavy fullerenes C 76 , C 78 , C 84 , and C 90 , as well as their mixtures; and by fulleroid materials are understood single-and multi-walled nabnotubes, nanobarrels, nano-onions, nanocones, and mixtures of these [4,5].The authors developed an original technique for mechanical and chemical processing of shungite-3 to obtain a heterogeneous catalyst. The technique includes the following processing stages: (a) decomposition of the rock in an alkaline (NaOH) melt at a temperature of 500 3520oC to remove aluminosilicate and silicate components; (b) washing of carbon phases with water to remove trace amounts of the alkali, with the subsequent grinding and sieving to obtain a powder with a grain size of 803100 mm; (c) acid treatment of carbon phases (HNO 3 65 wt %) at 60 3 65oC for 335 h to remove mixtures of metals, their oxides, and s...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.